Tracker: OpenGL rendering issues

[AlexisDrogoul]

A number of issues deal with the rendering quality of OpenGL displays. I have decided to regroup them here in order, one day, to try to deal with them systematically once we revise the rendering architecture.

• [x] #2174 describes a degradation of the rendering quality after a keystone transformation
• [x] #2159 describes a problem of flickering (probably due to z-fighting) when moving the mouse over the screen with trace on.
• [x] #2288 describes a problem where the overlay layer position is not completely fixed in OpenGL
• [x] #2276 (after gama-platform/gama#828) describes a problem of colours fading (probably due to light)
• [x] #2380 points at the bad rendering of large images used as background on OpenGL displays (improved but still worse than Java2D)
• [x] #1678 tries to understand how to render OpenGL displays in headless mode
• [x] #2127 (after gama-platform/gama#1718) asks for increasing the quality of line drawing
• [ ] gama-platform/gama#2208 exposes a problem with transparent colours and the drawing of built-in shapes (like cubes)
• [x] gama-platform/gama#2279 describes a wrong behaviour of the trace when layers move in the z dimension
• [ ] gama-platform/gama2#28 describes a problem of shading with Obj files
• [ ] gama-platform/gama2#29 describes a problem (blank screen) when the size of the model environment is too small (<1#mm).
• [ ] gama-platform/gama2#32 describes a bug (rotation about an axis which is not perpendicular to XY plan) when both rotation: and size: are used to draw a sphere or a cylinder
• [ ] gama-platform/gama2#42 shows that polygons with holes in 3D do not display their internal faces
• [ ] gama-platform/gama#2759 raises an issue with the display of textures on rotated geometries
• [ ] gama-platform/gama#2754 raises an issue with the display of textures for specific camera_pos values
• [x] #2923 grid facets (at least elevation, grayscale and triangulation) does not work on windows

Feel free to add new issues about quality rendering in OpenGL and reference them here.

[AlexisDrogoul]

gama-platform/gama#2159 is probably related to gama-platform/gama#2224.

[AlexisDrogoul]

gama-platform/gama#2159 is solved by the fix to gama-platform/gama#2224 .